Adjustable lathe-mandrel



(No Model.)

J. L. WILLIAMS. ADJUSTABLE LATHE MANDREL.

No. 470,416. Patented Mar. 8, 1892.

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J OIIN L. WILLIAMS, OF PHILADELPHIA, PENNSYLVANIA.

I ADJUSTABLE LATHE-IVIANDIREL.

SPECIFICATION forming part of" Letters Patent No. 470,416, dated March 8, 1892.

Application filed August 8. 1891.

To @ZZ whom it may concern:

Be it known that I, JOHN L. WILLIAMS, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Adjustable Lathe-Mand rels, which improvement is fully set forth in l[he following specification and accompanying drawings.

My invention relates to improvements in adjustable lathe-mandrels; and it consists of a mandrel provided with an adjustable collar for carrying thereon the object to be turned, as will be hereinafter described and definitely claimed.

Figure l represents a longitudinal section of a mandrel embodying my invention. Fig. 2 represents a longitudinal section of a modification of the device. Figs. 3,4, 5, and 7 represent sections on lines c y fy .c e of Fig. 2 and fr of Fig. l, respectively. Fig. 6 represents an end view of the device. Fig. 8 represents a longitudinalsection of the reinforce central piece or portion of the collar.

Similar letters of reference indicate corresponding parts in the several figures.

Referring to the drawings, A designates a spindle, which formsV the fixed part of the mandrel and is adapted to be attached to a suitable rotating portion of the lathe, such as the axle of the head-stock. The said spindle has a main portion B with an inclined shoulder C between it and an enlarged portion D. Mounted on ascreW-threaded end Aof the portion B of the spindle A is a rotatable nut E, to which is secured a sleeve F, having a diameter substantially equal to the portion D of the spindle. The inner end of the said sleeve is beveled on its outer face to correspond with the beveled or inclined shoulder C, for the purpose hereinafter explained.'

Movable longitudinally on the portion D of the spindle and a cylindrical portion of the sleeve F are the split sleeves G and G', respectively, the said sleeves having inclined outer faces with screw-threads thereon, on which work the clamping-nuts H H and have beveled inner faces G2 at their inner ends.

Between the sleeves G and G and on the spindle A is a collar J, on which the work or article to be turned is held. The said collar Serial No. 402,148. (No model.)

`the shoulder C and the beveled end of the sleeve F, and are adapted to be lnoved in directions so as to either increase or decrease the diameter of said collar.

Vhen a long collar is required to be used, the same is formed of sectional end parts and a central section or strengthening-piece K, 6o formed of a tube having inclined ends corresponding to the shoulder C and the beveled end of the sleeve F, the sections of the end parts having each an end resting on said piece K.

To secure rotation of the sleeve G with the sleeve F, the latter has a` pin L, projecting into the slot M in the former.

In adjusting the mandrel the sleeve G and nut H is removed from the device and the 7o hollow piece of material to be turned is placed on the sections of the collar J, after which the said sleeve and nut is replaced, so as to hold the outer ends of the said sections on the spindle. The nut E is then rotated, whereby the beveled end of the sleeve F, entering between the sections of the said collar and the spindle, spreads the said sections at that end thereof until the corresponding end of the bore of the article placed on the collar is 8o filled, when the sleeve G, having-its inner beveled end in contactm with said collar, is tightly clamped by means of its nut H on the said sleeve F. The nut E is further rotated, causing the sleeve G to bear against its end 8 5 of the collar J, so that the other end thereof ascends on the inclined shoulder C and within the beveled inner end of the sleeve G until it has expanded sufliciently to iill the corresponding end of the bore of the article there- 9o on, when the nut H is screwed on the said sleeve G', tightening the latter in place on the spindle.

The operation of the collar having the strengthening or reinforce piece K in adjusting the mandrel is similar tothe operation already described, as can be readily understood.

Having thus described my invention, whatI claim as new, and desire -to secure by Letters roo Patent, is- A l. An adjustable mandrel consisting of a zo for securing said collar in place on said spini spindle having a main portion with an inclined shoulder and a threaded end, a rotatable nut with sleeve having a beveled end, splitI sleeves mounted on an enlarged portion of the spindle and the said beveled end of the nut-sleeve, and elampingnuts for said split sleeves, said parts being combined substantially as described.

2. An adjustable mandrel having alongitudinal sectional collar mounted on a spindle, mechanism secured to said spindle for expanding said collar, and split'sleeves and clamping-nuts for binding said collar when adjusted, said parts being combined substantially as described.

3. An adjustable mandrel consisting of a spindle, a sectional expansible collar thereon, a rotatable, nut and sleeve for expanding said collar, and a split sleeve with clamping-nut dle, said parts being combined substantially as described.

4. An adjustable mandrel consisting of a spindle having a main portion with a screwthreaded end, an enlarged portion, and an intervening inclined shoulder, a nut on said threaded end having a sleeve connected therewith, the said sleeve having a beveled inner end corresponding to the said inclined shoulder, a split sleeve adapted to be rotatably connected with said first-mentioned sleeve and having a beveled inner face on its inner end, asplit sleeve With beveled inner face mounted on the enlarged portion of the spindle, and clamping-nuts on said split sleeves, said parts being combined substantially as described.

JGHN L. VILLIAMS.

Witnesses:

JOHN A. WIEDERsHnrM, R. H; GRAEsER. 

